Eric, Hammel Books

New Georgia Bougainville and Cape Gloucester

By Eric M. Hammel

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First Across the Rhine

By Col David E Pergrin

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Fire in the streets

By Eric M. Hammel

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The Tet Offensive of 1968 was the most important military campaign of the Vietnam War. The ancient capital city of Hue, once considered the jewel of Indochina's cities, was a key objective of that...

Ambush Valley

By Eric M. Hammel

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Chosin

By Eric M. Hammel

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The American aces speak

By Eric M. Hammel

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The American aces speak

By Eric M. Hammel

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76 Hours

By Eric Hammel, John E. Lane, Eric M. Hammel

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Ace a Marine Night Fighter Pilot in World War II

By R. Bruce Porter, Eric Hammel

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Air war Europa

By Eric M. Hammel

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.